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If one of the contraries is true, then the truth value of the other is

Contraries cannot both be true. If one is true, the other must therefore be false, although both may be false.

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If one of the contraries is true, then the truth value of the other is

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Correct answer C

Contraries cannot both be true. If one is true, the other must therefore be false, although both may be false.

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